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| 1 // Copyright 2008 the V8 project authors. All rights reserved. | 1 // Copyright 2008 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
| 4 // met: | 4 // met: |
| 5 // | 5 // |
| 6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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| 28 #ifndef V8_JUMP_TARGET_H_ | 28 #ifndef V8_JUMP_TARGET_H_ |
| 29 #define V8_JUMP_TARGET_H_ | 29 #define V8_JUMP_TARGET_H_ |
| 30 | 30 |
| 31 #include "virtual-frame.h" | 31 #include "virtual-frame.h" |
| 32 | 32 |
| 33 namespace v8 { namespace internal { | 33 namespace v8 { namespace internal { |
| 34 | 34 |
| 35 // ------------------------------------------------------------------------- | 35 // ------------------------------------------------------------------------- |
| 36 // Jump targets | 36 // Jump targets |
| 37 // | 37 // |
| 38 // TODO(): Update this comment. | |
| 39 // | |
| 40 // A jump target is an abstraction of a basic-block entry in generated | 38 // A jump target is an abstraction of a basic-block entry in generated |
| 41 // code. It collects all the virtual frames reaching the block by | 39 // code. It collects all the virtual frames reaching the block by |
| 42 // forward jumps and pairs them with labels for the merge code along | 40 // forward jumps and pairs them with labels for the merge code along |
| 43 // all forward-reaching paths. When bound, an expected frame for the | 41 // all forward-reaching paths. When bound, an expected frame for the |
| 44 // block is determined and code is generated to merge to the expected | 42 // block is determined and code is generated to merge to the expected |
| 45 // frame. For backward jumps, the merge code is generated at the edge | 43 // frame. For backward jumps, the merge code is generated at the edge |
| 46 // leaving the predecessor block. | 44 // leaving the predecessor block. |
| 47 // | 45 // |
| 48 // A jump target must have been reached via control flow (either by | 46 // A jump target must have been reached via control flow (either by |
| 49 // jumping, branching, or falling through) at the time it is bound. | 47 // jumping, branching, or falling through) at the time it is bound. |
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| 214 bool is_shadowing_; | 212 bool is_shadowing_; |
| 215 #endif | 213 #endif |
| 216 | 214 |
| 217 DISALLOW_COPY_AND_ASSIGN(ShadowTarget); | 215 DISALLOW_COPY_AND_ASSIGN(ShadowTarget); |
| 218 }; | 216 }; |
| 219 | 217 |
| 220 | 218 |
| 221 } } // namespace v8::internal | 219 } } // namespace v8::internal |
| 222 | 220 |
| 223 #endif // V8_JUMP_TARGET_H_ | 221 #endif // V8_JUMP_TARGET_H_ |
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